Studies on poly(diphenylamine) synthesized electrochemically in nonaqueousmedia

Poly(diphenylamine) has been synthesized electrochemically under galvanosta tic condition in nonaqueous acetonitrile media at different monomer concent rations. The W-Vis spectra reveals the selective formation of conducting ph ase similar to 840 nm at a low monomer concentration of 0.05 M. An increase in monomer concentration to 0.1 and 0.4 M leads to a loss in selectivity i n the formation of conducting phase (especially at a higher time interval). The characteristics observed in the IR absorption spectra are in accordanc e with those obtained in the UV-Vis spectra. Morphology of the films exhibi t a change over from fibrillar to granular type on going from a monomer con centration of 0.05 to 0.4 M. The effect of monomer concentration on the red o?; properties of diphenyl amine and poly(diphenylamine) are investigated u sing a cyclic voltammetric technique. On comparing the two sets of cyclic v oltammograms, a shift in peak potential is observed. From the thermal analy sis it is found that the loss in second step is greater at lower monomer co ncentration due to predominant formation of conducting phase. (C) 1999 Else vier Science S.A. All rights reserved.